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I installed Stage 2 AP three days ago, with stock gutted UP and helix catted DP. The car felt much much stronger than when it was stock. However, when I read the live boost in AP, the highest I saw was only 10.8 PSI in the third gear. I wasn't running at WOT at the time, only partial throttle so maybe that's to flame. The strange thing is, when I held and cruised at 4,000 RPM in the second gear, the AP still read a negative boost, or 1 to 2 PSI at the most. Does turbo only kick in when you are accelerating?

I am pretty sure there is not a leak in the system. I had my mechanic do the install on the UP and DP and we checked over and over to make sure there's not a leak. Why would I not even see the stock boost level of 13.5 PSI even though the car felt much stronger?

You will only get max boost pressure when you are going WOT. That is your first problem. 10.8 is only what it's going to read at partial. Try going WOT and see what it reads... I guarantee it will be higher.

If you are just cruising at 4000rpms, it's going to be the same as if you were cruising at 1500rpms. The turbo only spools under acceleration. If you go WOT at 4000rpms the turbo will spool much quicker than at 1500rpms, but it's the same idea. When just cruising, boost will be under 0psi, it will be in vacuum. It's not until you put your foot into it that it builds boost.

You don't have any problems it sounds like. Go out and go WOT and see how the AP reads then.

I just reflashed my base map to Stage 2 CA 91 since I was using the regular Stage 2 91 before and I wanted to play safe and not get knocking (I am in CA). Went out for a run and saw a 14.8 peak boost. Yay now I am happy. I don't have a 3" catback so that's probably why I couldn't hit the 15.8 advertised. Nevertheless I am happy enough with 14.8. With a couple days of ECU learning I should be able to hit 15 PSI.